Samuel danes



UNITED STATES PATENT OFFICE.

SAMUEL DANKS, OF CINCINNATI, onto.

Specification forming part of Letters Patent No. 136,421, dated March 4, 1873.

To all whom it may concern:

Be it known that I, SAMUEL DANKS, of Cincinnati, Ohio, have invented an Improved Method of Lining Rotary Puddling-Furnaces, of which the following is a specification:

This invention relates to a novel method of lining rotary puddlingfurnaces, and more especially the furnace described in the specifications of former Letters Patent heretofore granted to me.

- The material of which my improved furnacelining is made is a compound of lime and oxide or silicate of iron or other metallic oxides, to which I sometimes add soda or potash, or other alkali, or common salt, or a quantity of all of these substances.

In making this compound, I dissolve the lime in water to the consistency of a thick cream. If the soda, potash, or salt is to be used, the same should be dissolved in the water before mixing the lime therein. I then add to this cream iron ore well pulverized, or other oxide or silicate, in such proportions as will give the compound the consistency of stiff mortar.

In lining the aforesaid furnace with my improved compound, I proceed as follows: The part of the inner surface of the revolving cylinder or chamber which occupies the lowest position is first covered with the aforesaid compound between and over the hollow ribs of the said cylinder. The compound is then dried, or allowed to dry, and becomes quite hard. The cylinder is then turned partially round, the said hollow ribs holding the compound securely in place. By t-hus turning the cylinder on its axis another portion of its surface is brought to the lowest position, and this portion is covered in like manner with the compound, which in turn is dried or allowed to dry, and the cylinder is again turned partially round, and so on till its entire surface is lined or coated with the aforesaid compound to a depth of about one inch above the top of the hollow ribs. When dry the said compound is very hard, and will not be displaced or fused by the heat of the furnace.

The aforesaid compound is also applied to the bridge-plate and the lower part of the shiftable piece described in the said former specifications to form a protective lining or coating for the same.

When the aforesaid lining or coating of the cylinder or chamber is dry, 1 make a fire in the furnace and introduce into the said cylinder pulverized iron ore, or other oxide or sili cate of iron, and melt the same in the cylinder, the latter being caused to revolve slowly. Then the temperature is slightly reduced to allow the molten oxide or silicate to set upon the surface of the compound and forma vitreous lining or covering thereon. Care must be taken that the ends of the revolving cylinder as well as the circular portions of its inner surface are covered both with the compound and the molten oxide or silicate.

After the first vitreous coatinghas been allowed to set or harden a fresh quantity of pulverized iron ore or other oxide of iron is thrown into the cylinder and melted therein. Then the revolution of the furnace is stopped, and the molten ore or oxide forms a bath in the bottom or lower portion of the revolving cylinder or chamben. Into this bath a number of large pieces or lumps of iron ore or oxide of iron, or other metallic oxides or suitable refractory material, are thrown. The molten ore or oxide, being thereby slightly cooled, sets or hardens, holding these pieces embedded in it, with their upper portions projecting above its surface. A further quantity of iron ore or 0xide is then thrown into the cylinder and melted, the cylinder being set in motion, as before. When this fresh quantity of the ore or oxide is melted the cylinder is stopped in a position nearly opposite to its last position the molten ore or oxide again forming a bath opposite, or nearly so, to that in which the aforesaid pieces are embedded.

Into this bath I also throw a number of large pieces of iron ore, or other metallic oxides or refractory material, which are set in the furnace by the cooling of the bath, with their upper portions projecting like those first described. This operation is repeated till five or six portions or the entire surface of the cylinder have been set with these proj ectin g pieces, care being taken to cool the molten ore or oxide with the pieces or lumps therein in such positions that the cylinder shall remain evenly balanced on its axis.

The furnace is then ready for puddling. As the lining wears it may be repaired from time to time by a repetition of the above processes.

In some cases the iron ore or oxide of iron may he melted in a separate furnace and poured in a molten state into the hot revolving chamber to form or renew the lining.

Claims.

1. Alining orfettling consisting ofthe abovedescribed compound, applied to the interior of the cylinder of a rotary puddling-furnace, and coated or covered with iron ore or other oxide or silicate of iron, as herein set forth.

2. The aforesaid lining or fettling of the cylinder of a rotary furnace, when there is fixed within said lining projecting pieces of iron ore or other suitable refractory material, as herein set forth, for the purpose specified.

SAMUEL BANKS.

Witnesses:

CHAS. J. Goocn, EDWARD G. J AGKSON. 

